Board drop hammer



Jan. 2o, 1,931. M TALCQTT' 1,789,568

BOARD- nRoP amsn Filed July 15 1926 *Piaaeafiazalei SPENCER corn? .NECTIGUT I .The invention consists yin the organization of means controlling 'the lifting vrollisjin. board drop hammers having? more 'thantwo pairs of liftingv rolls and itsfobject is to provide simple mechanism whereby-'such rolls maybe simultaneously and equally moved intogripping relation with the hammerboardend simultaneously andpositivelywithdrawn therefrom as lhereinafter more vj "vm fully explained in conjunction with tlieraccompanyi'ng drawing.y Y r f y 1n said drawing, Fig. 1 is a vertical front elevation of a threeroll-set board drop ham-l mer. Y

Fig. 2 a in section, 'and larger scale side"elevationjpartly v Fig.' 3a horizontal section ,takenjust' above the intermediate roll set;

i The machineas shown 1n-F`Yig.,1,comprises i ",120 a basel, two upri'ghts 2 in which thehammer 3 is guided and ahead structure in which the several sets or pairs of rolls are'mounted. The rear rolls of all the sets are7marked 5' and each is fixed on an axle 6, which is jour- V25 nailed at its ends in eccentric sleeve bearings 7', thelatter being; journalled directly inthe bead frame.l Each eccentric bearing sleevev? -isprovided'with a rearwardly extending arm,

8 at each end and thetwo arms pertinent to 3o each roll are rigidly joined together by a cross pin 9, Fig. 2. lAll thecrosspins 9 are rigidlyV connected together andto anadjust- Y 1 mentrod 10, which issecured tothe frame with suitable provisions for-its l535A adjustment. Itwill be understood that'f'this i *adj ustment simultaneously and equallyrocks V all of vthe farms .18 and eccentric-"bearings y7,' f thereby causing the rear rolls 5 to be equally j andV simultaneously advanced or Withdrawn 4o with reference to the plane of the hammer- -aboard 3a, as will be understood(A Y The several front rolls are ma'lled'llf12 i and 13 respectively kand leach is similarly f Xed to an axle 6 and the'latter are journalled 45 in eccentric bearings or sleeve 7, lwhichsleeves are j ournalled in the head frame. These eccemmic sleeve bearings 'are also provided with arms,projecting;v forwardly and markedll,

l'and 16 respectively, the twoarms pertinentl "5c to each roll being joined by crosspins 17,18

respectively.

--link 21-tolthe cross pinglffotheeccentric ratiofof the lever armsv isY as 2 to l; 1

logitudinal Y au;1.igffspaeevaa,i ,enfasi pas; at j Y ends ofj such e sli'own'gas- 'clamped inthe split arinsjwhich iz'ormsafrigidconnectionbetween the,armsfor'each'rollrf;; i

Allthe-arms'ofthe front are 'connected toA the frictfeirifbar 26 softhat the' flatterffmayfsimultaneously move them c cauSetheirrQllsftobe advanced f into pressing'contact Vwithitliehamiller-board 'and .withdrawn therefroinxy @To this endJ the" arms 15 and16'o thelowesti'an'dintermedi-s ate front rolls areconnectedy to each other by.'

and thereby angularly related linksylmarked'21 r*and 22V an an'gle to ,each other vvabout as indicated the; drawing; 'andat ltheir connectediends',v they` are :pivote Vtribut 'ngllever lever is connectedv by anzupwardly extending digon@ endoffpmssuredis;

varms '111 of thefiipper front roll11`. 1 The upper endrof, the frictiony bar 201is connected? to the diStributing lever 23 iat apoint 'nearertothe i vend connectedto the two' rolls than to the Y othery 'endf andl approximately so -that'rthe r -Tlie pressuredistributing system above dei 1 move independently oeach other; 'sothat the weight of the friction-bartransmitted tothem' throughithedistributing lever 23deV approxif scribed permits they roll iarmsff'lf andf16fto Y mately {equa-lized .asloetvveeny thesetw'orollslr 5 i .The kother `roll* arms .i4-also haveffjreedom'or Byfvi-rtueoftlie ratioof ,the arms 'of lever23 into grippingrelation tofthe"liammereboard and/into"substantially equa-lfrictional Vconf f `tact therewith, the rollv armslil and V16y beingall of equal radius andthe eccen'tricitiesv yeqnalandin"the'saine direction; :The actual f1 i l* movement,ot1 the-rolls themselves toward'the Y board 's slightV .and 'when the r-iction 'bar is lited,.all tells are yvithdrawniromthe:

oa off/theirseveral-bearing sleeves :beingalso 

